JPH10252171A - Inorganic fibrous ceiling board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic fibrous ceiling board hard to make the dew condensation inside an inorganic fibrous board and capable of maintaining sound absorption efficiency and heat insulating efficiency even when the inorganic fibrous ceiling board is constructed in such a structure as the indoor side becomes high temperature and high humidity. SOLUTION: A waterproofing film 2 having over 50m<2> .hr.mmHg/g of vapor resistance is stuck on the surface placed to the indoor side of an inorganic fibrous board 1 with an adhesive 3. The surface placed on an attic space side of the inorganic fibrous board 1 is covered with a waterproofing film 4 having vapor resistance less than 1/5 of vapor resistance of the waterproofing film 2. The waterproofing film 2 on the indoor side and waterproofing film 4 on the attic space side are connected at those circumferential edge sections, and the circumference of the inorganic fibrous board 1 is completely covered to constitute a ceiling board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic fiber ceiling plate which is suitably used for a building having a high temperature and high humidity inside the room, for example, a building such as an indoor heated pool.

[0002]

2. Description of the Related Art Conventionally, inorganic fiberboards made of glass wool, rock wool or the like have been used as ceiling boards for buildings such as office buildings and public facilities. Since the inorganic fiber ceiling plate is porous, it is excellent in sound absorption and heat insulation. However, because it is porous,
Water absorption is large, and when rainwater or water vapor adheres to the surface,
There has been a problem that the inorganic fiber ceiling plate swells due to the capillary phenomenon and is held inside, and the inorganic fiber ceiling plate swells to change the shape or to deteriorate the sound absorbing property and the heat insulating property. Therefore,
In particular, it has been difficult to use a building having a high temperature and high humidity on the indoor side, for example, a building such as an indoor heated pool.

Various proposals have been made to solve this problem. For example, Japanese Patent Application Laid-Open No. 57-12746 discloses a heat insulating material for buildings in which the entire surface of an inorganic fiber board is covered with a water-repellent and moisture-proof paper. Further, Japanese Utility Model Laid-Open No. 2-134108 discloses a heat insulating and soundproofing material in which the entire surface of an inorganic fiber board is covered with a sheet having moisture permeability, waterproofness and windproofness. Furthermore, Japanese Patent Publication No. 2-32419 discloses that a moisture-proof layer is provided on the indoor side of an inorganic fiber board, and a waterproof layer having a local moisture permeability on the back side of the hut is not bonded to the inorganic fiber board at all, or There is disclosed a ceiling plate provided in a state in which it is bonded to the ceiling plate.

[0004]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
Insulation material for buildings disclosed in 57-12746, when used as a ceiling plate of a building where the interior side is high temperature and high humidity, even if the interior side is covered with water-repellent moisture-proof paper, the indoor side water vapor is removed. It cannot be completely shut off, and steam gradually enters the inside of the inorganic fiberboard due to the steam pressure difference between the indoor side and the back of the hut. Once the steam enters, the backside of the hut is also covered with water-repellent and moisture-proof paper, so it is difficult to discharge to the backside of the hut. Swells, and reduces the sound absorption and heat insulation.

Further, the heat insulating and soundproofing material disclosed in Japanese Utility Model Laid-Open Publication No. 2-134108, when used as a ceiling plate of a building where the interior is hot and humid, covers both the interior and the back of the cabin with a moisture-permeable sheet. Therefore, there is a problem that a large amount of water vapor on the indoor side permeates to the back side of the hut and a large amount of dew forms on the back side of the hut. In addition, since the dewed water drops on the waterproof sheet on the back side of the cabin and stays there, the moisture permeation from the sheet on the back side of the cabin is hindered. However, there is a problem that the water is hardly discharged from the sheet on the back side of the hut, and water is condensed in the inorganic fiber plate to form water. In the long term, the inorganic fiber plate swells and the sound absorbing property and the heat insulating property are deteriorated.

[0006] Furthermore, in the ceiling plate disclosed in Japanese Patent Publication No. 2-32419, even if the indoor side is covered with a moisture-proof layer, water vapor gradually flows into the inorganic fiber plate due to the water vapor pressure difference between the indoor side and the back side of the hut. However, since the moisture-proof layer on the back side of the hut has only a part of the moisture-permeable layer, the invading water vapor is not sufficiently discharged, and dew forms inside the inorganic fiber board to form water. There has been a problem that the fiber ceiling plate swells and the sound absorption and heat insulation are reduced. Also, this ceiling board,
Adhesive is used to bond the moisture-proof layer on the indoor side and the waterproof layer on the back side of the hut, so the durability of the bonded part is poor, water easily penetrates from this part, and the inorganic fiber ceiling panel itself contains water. In addition, there has been a problem that the shape of the inorganic fiber ceiling plate changes, and the appearance may deteriorate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object to prevent dew condensation from occurring inside an inorganic fiber plate even when constructed on a building where the indoor side is hot and humid. An object of the present invention is to provide an inorganic fiber ceiling panel capable of maintaining sound absorption and heat insulation over a long period of time.

[0008]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is to provide a ceiling panel in which each surface of an inorganic fiber board disposed on the indoor side and the back side of a hut is covered with a waterproof film. i) moisture permeation resistance of the waterproof film of the indoor side 50m ² · hr · mm
Hg / g or more, ii) the moisture permeability resistance of the waterproof film on the back side of the hut is 1/5 or less of the moisture permeability resistance of the waterproof film on the indoor side, and iii) the waterproof film on the indoor side. Are bonded to the inorganic fiberboard with an adhesive, and iv) the inorganic film, wherein the waterproof film on the indoor side and the waterproof film on the back side of the hut are joined at their peripheral edges. A fiber ceiling panel is provided.

A second aspect of the present invention is to provide the inorganic fiber ceiling panel according to the first aspect, wherein the waterproof film on the indoor side is provided with an uneven pattern and / or a printed pattern.

A third aspect of the present invention is to provide an inorganic fiber ceiling panel according to the first or second aspect, wherein the waterproof film on the back side of the hut is made of a heat-shrinkable film, and the heat-shrinkable inorganic fiber ceiling plate is provided.

A fourth aspect of the present invention is the inorganic material according to any one of the first to third aspects, wherein the waterproof film on the indoor side and the waterproof film on the back side of the cabin are joined by heat fusion. A fiber ceiling panel is provided.

According to the first aspect of the present invention, since the moisture-permeable resistance of the indoor waterproof film is high, the indoor water vapor hardly enters the inorganic fiber board. Also, even if the moisture resistance of the waterproof film on the indoor side is high, the water vapor pressure difference between the indoor side and the back side of the cabin cannot completely prevent the invasion of water vapor.
Although the water vapor gradually enters the inside of the inorganic fiberboard, the water vapor that has entered the waterproof film on the attic side has a low moisture permeation resistance. Therefore, the water vapor is prevented from being condensed in the inorganic fiber board, and the sound absorbing property and the heat insulating property are prevented from being impaired, and the shape is prevented from being changed and the appearance is deteriorated.

[0013] According to the second aspect of the present invention, the waterproof film on the indoor side is provided with a concavo-convex pattern and / or a printed pattern, so that a design as an interior material can be imparted.

According to the third aspect of the present invention, since the waterproof film on the back side of the hut is thermally contracted, the waterproof film on the indoor side is pulled during the thermal contraction, and the waterproof film adheres to the entire surface of the inorganic fiber board. And can be coated.
Therefore, it can be constructed exactly when it is constructed on the ceiling, and the appearance when viewed from the indoor side is good.

According to the fourth aspect of the present invention, the waterproof film and the waterproof film on the back side of the hut are securely joined, and the waterproof property and the durability of the joint are excellent.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, inorganic fiber boards include inorganic fibers such as glass wool and rock wool.
A glass wool plate can be used that is molded into a mat shape by applying a binder containing a synthetic resin such as a phenol resin as a main component, heated and pressed, and has excellent sound absorbing properties and light weight. It is preferably used. The density of the inorganic fiber board, depending on the size of the construction to the ceiling plate, usually, preferably ^{32~150kg / m 3, 64~120kg / m} 3 and more preferably. If the density is less than 32 kg / m ³ , the rigidity of the ceiling plate is not sufficient, and if it exceeds 150 kg / m ³ , the cost increases and the cost becomes disadvantageous, which is not preferable. Further, the thickness of the inorganic fiber board is preferably 10 to 100 mm, more preferably 20 to 50 mm. When the thickness is less than 10 mm, the rigidity of the ceiling plate is not sufficient, and there is a possibility that deflection occurs after construction.If the thickness is more than 100 mm, the cost becomes high and it is economically disadvantageous. Absent.

In the present invention, examples of the waterproof film covering the surface of the inorganic fiber board disposed on the indoor side include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinylidene chloride copolymer, and fluororesin. Can be used alone or laminated in multiple layers, but from the viewpoint of the flame retardancy of the film, polyvinyl chloride, polyvinylidene chloride,
A film composed of a vinyl chloride-vinylidene chloride copolymer and a fluororesin is particularly preferred.

The indoor waterproof film has a moisture permeability of 50 m ² · hr · mmHg / g or more, preferably 80 m ² · h.
Use r · mmHg / g or more. Moisture permeability resistance is 50m ²・ hr ・ mmHg
If it is less than / g, it is not possible to sufficiently prevent indoor water vapor from entering the inside of the inorganic fiberboard. Furthermore, the moisture permeability resistance of the waterproof film can be set to a desired value by appropriately adjusting the thickness of the film, the amount of the plasticizer and the like added to the resin, and the like. Incidentally, in the present invention, the moisture permeability resistance is JIS Z020
8 means the value measured under the conditions of 40 ° C × 90RH%.

The thickness of the waterproof film on the indoor side is 10 to 15
0 μm is preferable, and 10 to 120 μm is more preferable. If the thickness is less than 10 μm, the handleability of the film is poor, and
The strength is not sufficient, and furthermore, the irregularities on the surface of the inorganic fiber board are undesirably exposed on the film surface. On the other hand, when the thickness exceeds 150 μm, the sound absorption of the ceiling plate is impaired, which is not preferable.

Further, the waterproof film on the indoor side is suitable for interior materials by forming an uneven pattern on the film surface by, for example, embossing, embossing or the like, or printing by gravure printing, offset printing or the like. It is preferable to provide designability. In addition, as the uneven pattern or the print pattern, for example, one or two selected from a stucco pattern, a satin pattern, a Fisher pattern, a travertine pattern, etc.
More than one species is preferably employed. Further, in order to prevent a temporal change due to the use environment, a treatment with an ultraviolet absorber, an antistatic agent, or the like may be performed.

On the other hand, as a waterproof film having a low moisture-permeation resistance used on the back side of the hut, a film of polyethylene, polypropylene, polyester, polyvinyl chloride or the like or a porous film, and a nonwoven fabric sheet produced by a flash method or the like can be used. Can be used, but a polyvinyl chloride film can be preferably used in view of the flame retardancy of the film.

The moisture resistance of the waterproof film on the back side of the hut is
In order to discharge the water vapor gradually entering the inside of the inorganic fiber board through the indoor waterproof film to the back of the cabin, the moisture resistance of the indoor waterproof film is 1/5 or less, preferably 1/10 or less. Is required, specifically 10
m is preferably ² · hr · mmHg / g or ^{less, 5m 2 · hr · mmHg /} g or less is particularly preferred.

The thickness of the waterproof film on the back side of the hut may be appropriately set within a range that satisfies the above-mentioned moisture permeability resistance.
It is preferably from 10 to 100 μm, particularly preferably from 20 to 50 μm.
If the thickness is less than 10 μm, the handling of the film is poor, and the strength is low.If the thickness is more than 100 μm, the sound absorption of the ceiling plate may be reduced, or the desired moisture permeability may not be obtained. Absent.

Further, in order to improve the adhesion between the indoor side film and the inorganic fiber board and improve the appearance and workability of the inorganic fiber ceiling board, a heat shrinkable film is used as the back side of the hut. It is preferable to cause the contraction. The heat-shrinkable film is provided with shrinkage by uniaxial or biaxial stretching, and its shrinkage is not particularly limited, but it is preferable that the film shrink to such an extent that the design of the indoor side film is not impaired.

In this case, after attaching the waterproof film on the indoor side to one surface of the inorganic fiber plate, the waterproof film on the back side of the hut covered from the other surface and the four sides are joined together to form the inorganic fiber plate. The entire surface is covered with two films. Next, the ceiling plate is heated in a hot air stove or the like to shrink the waterproof film on the back side of the heat-shrinkable shed. By doing so, the film on the indoor side joined to the shrunk film on the back side of the cabin is pulled, and the inorganic fiber board and the films on the indoor side and the back side of the cabin come into close contact with each other.

As a method for bonding the inorganic fiber plate and the waterproof film on the indoor side, an emulsion type adhesive, a solvent type adhesive, a hot melt type adhesive or the like can be used, but in terms of water resistance and workability. It is preferable to use a hot-melt adhesive, and it is particularly preferable to use a flame-retardant hot-melt adhesive.

The bonding of the two types of waterproof films on the indoor side and the back side of the hut can be performed by heat fusion or bonding with an adhesive, but the thermal fusion is performed in view of ensuring waterproofness and durability of the joint. Adhesion is preferred, and as the heat sealing method, heat sealing, impulse sealing, high frequency sealing, ultrasonic sealing, or the like can be suitably used according to the sealing performance of the film to be used.

FIG. 2 shows a state in which the inorganic fiber board 1 is covered with a waterproof film 2 on the indoor side and a waterproof film 4 on the back side of the hut. That is, the waterproof film 2 on the indoor side slightly larger in size than the inorganic fiberboard 1 is attached to one side of the inorganic fiberboard 1 via the adhesive layer 3, and four sides of the film 2 are placed on the outer periphery of the inorganic fiberboard 1. Protrude and glue. Next, the waterproof film 4 on the back side of the hut is placed on the other surface of the inorganic fiber board 1, and the four sides of the inorganic fiber board 1 are covered with the periphery of the waterproof film 4 on the back side of the hut. The peripheral edge of the film 4 is joined to the peripheral edge of the waterproof film 2 on the indoor side by a method such as heat fusion. In the figure, reference numeral 5 denotes a film joint.

In this case, it can be used as a ceiling plate. In this case, the width of the peripheral portion of the waterproof film 2 on the indoor side protruding from the four side surfaces of the inorganic fiber board 1 is adjusted to the width on the indoor side. It is preferable from the viewpoint of the appearance and workability of the inorganic fiber ceiling panel to be as small as possible without impairing the joining between the waterproof film 2 and the waterproof film 4 on the back side of the hut.

Further, as described above, in order to improve the appearance and workability of the inorganic fiber ceiling plate, it is preferable to use a heat-shrinkable film as the waterproof film 4 on the back side of the hut and to heat-shrink it. In other words, after using a heat-shrinkable film as the waterproof film 4 on the back side of the hut, as shown in FIG. 2, the inorganic fiber board 1 covered with the waterproof films 2 and 4 is placed in a hot-blast furnace or the like and heated. By heat-shrinking the waterproof film 4 on the back side of the cabin, the waterproof film 2 on the indoor side is pulled by the waterproof film 4 on the back side of the cabin contracted in the direction of the arrow in the figure, as shown in FIG. The waterproof films 2 and 4 adhere to the outer periphery of the inorganic fiber board 1, and the inorganic fiber board 1 is completely covered with the waterproof films 2 and 4.

By doing so, the outer peripheral corner of the inorganic fiber ceiling plate is sharpened, so that the appearance is improved, and when the ceiling plate is constructed by the grid method, it protrudes from the four side surfaces of the inorganic fiber plate 1. Since the peripheral portion of the waterproof film 2 on the indoor side does not obstruct, the workability is improved,
Furthermore, since the peripheral part does not hit the grid member and the ceiling plate does not float, the appearance of the ceiling after construction does not deteriorate.

[0032]

【Example】

Example 1 As an inorganic fiber board, density 80 kg / m ³ , thickness 25 mm, size
A 600 mm × 900 mm glass wool plate was used. One side of this glass wool plate, as a waterproof film on the indoor side, embossed with a stucco pattern to give designability, 60 μm thick, 57 m ² · hr · mmHg / g hard polyvinyl chloride Film with flame-retardant hot melt adhesive
Lamination was carried out leaving a film length of 50 mm on all four sides.

On the other side of the glass wool plate, a waterproof film on the back side of the hut was formed to have a thickness of 20 μm and a moisture permeability of 10 m ^2.
・ Hr ・ mmHg / g heat shrinkable polyvinyl chloride film
Cover the four sides of the glass wool plate with the film on the back side of the hut,
The film on the inside of the room was heat-sealed to an inner 30 mm portion of the four sides using an impulse sealer.

This was heated in an oven at 150 ° C. for 15 seconds to shrink the film on the back side of the hut, and the films on the indoor side and the back side of the hut were respectively brought into close contact with the surface of the glass wool plate to obtain an inorganic fiber ceiling plate. In this embodiment, the moisture permeability resistance of the film on the back side of the cabin is 1 / 5.7 times the moisture permeability resistance of the film on the indoor side.

Example 2 The same glass wool plate as in Example 1 was used as an inorganic fiber plate. One side of this glass wool plate is embossed with a stucco pattern as a waterproof film on the indoor side to give it a design, thickness of 100 μm, moisture permeability of 80 m ² · h
A rigid polyvinyl chloride film of r · mmHg / g was bonded with a flame-retardant hot melt adhesive, leaving a film surplus length of 50 mm on all four sides.

On the other surface of this glass wool plate, a waterproof film on the back side of the hut was formed to have a thickness of 20 μm and a moisture resistance of 10 m ^2.
・ Hr ・ mmHg / g heat shrinkable polyvinyl chloride film
Cover the four sides of the glass wool plate with the film on the back side of the hut,
The film on the inside of the room was heat-sealed to an inner 30 mm portion of the four sides using an impulse sealer.

This was heated in an oven at 150 ° C. for 15 seconds to shrink the film on the back side of the hut, and the films on the indoor side and the back side of the hut were respectively brought into close contact with the surface of the glass wool plate to obtain an inorganic fiber ceiling plate. In this embodiment, the moisture permeability resistance of the film on the back side of the hut is 1/8 times the moisture permeability resistance of the film on the indoor side.

Example 3 The same glass wool plate as in Example 1 was used as an inorganic fiber plate. On one side of this glass wool plate, as a waterproof film on the indoor side, a thickness of 20 μm and a moisture permeability resistance of 330 m ²
・ Hr ・ mmHg / g vinyl chloride-vinylidene chloride copolymer resin film with flame retardant hot melt adhesive
The films were laminated while leaving an extra film length of mm.

On the other surface of this glass wool plate, a waterproof film on the back side of the hut was formed to have a thickness of 20 μm and a moisture permeability of 10 m ^2.
・ Hr ・ mmHg / g heat shrinkable polyvinyl chloride film
Cover the four sides of the glass wool plate with the film on the back side of the hut,
Using a high-frequency sealer, the film was heat-sealed to 30 mm inside the four sides of the film on the indoor side.

This was heated in an oven at 150 ° C. for 15 seconds to shrink the film on the back side of the hut, and the films on the indoor side and the back side of the hut were respectively brought into close contact with the surface of the glass wool plate to obtain an inorganic fiber ceiling plate. In this embodiment, the moisture permeability resistance of the film on the back side of the cabin is 1/33 times the moisture permeability resistance of the film on the indoor side.

Comparative Example 1 The same glass wool plate as in Example 1 was used as an inorganic fiber plate. One side of this glass wool plate is embossed with a stucco pattern as a waterproof film on the indoor side to give it a design, thickness of 100 μm, moisture permeability of 80 m ² · h
A rigid polyvinyl chloride film of r · mmHg / g was bonded with a flame-retardant hot melt adhesive, leaving a film surplus length of 50 mm on all four sides.

On the other side of the glass wool plate, a waterproof film on the back side of the hut was formed to have a thickness of 100 μm and a moisture permeability of 24 μm.
A soft polyvinyl chloride film of m ² · hr · mmHg / g was placed, and four sides thereof were adhered to the periphery of the waterproof film on the indoor side using a solvent-type adhesive, thereby forming an inorganic fiber ceiling plate. In this embodiment, the moisture permeability of the film on the back side of the cabin is 1 / 3.3 times that of the film on the indoor side.

Comparative Example 2 The same glass wool plate as in Example 1 was used as an inorganic fiber plate. On one side of this glass wool plate, as a waterproof film on the indoor side, a thickness of 20 μm and a moisture permeability resistance of 330 m ²
・ Hr ・ mmHg / g vinyl chloride-vinylidene chloride copolymer resin film with flame retardant hot melt adhesive
The films were laminated while leaving an extra film length of mm.

On the other side of the glass wool plate, the same film as the waterproof film on the indoor side was placed as a waterproof film on the back side of the hut, and the four sides of the glass wool plate were covered with films on the back side of the hut. Using a high-frequency sealer, heat-sealed the inner 30 mm of the four sides of the film,
An inorganic fiber ceiling panel was used. In this embodiment, the moisture permeability resistance of the film on the back side of the cabin is one of the moisture permeability resistance of the film on the indoor side.
Doubled.

Test Example Each of the inorganic fiber ceiling panels of Examples 1 to 3 and Comparative Examples 1 and 2 was
Indoor temperature 35 ° C, Humidity 95RH%, Attic temperature 10 ° C, Humidity 40RH
%, And the state of dew condensation inside the ceiling plate after 6 months was confirmed by the cloudiness inside the film on the back side of the hut and the weight change of the ceiling plate before and after the test. Table 1 shows the results. In Table 1, the weight ratio of the ceiling panel before and after the test means the weight of the ceiling panel before the construction is set to 100.
It is a value representing the ratio of the weight of the ceiling plate after the test.

[0046]

[Table 1]

From the results shown in Table 1 above, all of the ceiling plates of the examples in which the moisture permeability resistance of the waterproof film on the back side of the hut is set to 1/5 or less of the moisture permeability resistance of the waterproof film on the indoor side. It can be seen that there is no condensation and there is no change in the weight of the ceiling plate.

On the other hand, the moisture permeability resistance of the waterproof film on the back side of the cabin is 1/5 of the moisture permeability resistance of the waterproof film on the indoor side.
In Comparative Example 1 which was made larger, and in Comparative Example 2 in which the waterproof film on the indoor side had high moisture permeability, but the waterproof film on the back side of the hut also had high moisture permeability, internal dew condensation occurred and the ceiling plate It can be seen that an increase in weight occurs.

[0049]

As described above, according to the inorganic fiber ceiling plate of the present invention, dew condensation is generated inside the inorganic fiber ceiling plate even when it is used in a place where the indoor side becomes high temperature and high humidity. It can be seen that the shape of the inorganic fiber ceiling plate can be maintained for a long time, and the sound absorbing property and the heat insulating property can be maintained well.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an inorganic fiber ceiling panel according to the present invention.

FIG. 2 is a cross-sectional view showing a state before the inorganic fiber board is covered with a waterproof film on the indoor side and a waterproof film on the back side of the hut, and the waterproof film on the back side of the hut is not thermally contracted.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inorganic fiber board 2 indoor waterproof film 3 adhesive layer 4 waterproof film on backside of hut 5 film joint

Claims (4)

[Claims] 1. A ceiling panel in which each surface of an inorganic fiber board disposed on the indoor side and the back side of a hut is covered with a waterproof film, i) a moisture resistance of the waterproof film on the indoor side is 50 m ² · hr.・ Mm
Hg / g or more, ii) the moisture permeability resistance of the waterproof film on the back side of the hut is 1/5 or less of the moisture permeability resistance of the waterproof film on the indoor side, and iii) the waterproof film on the indoor side. Are bonded to the inorganic fiberboard with an adhesive, and iv) the inorganic film, wherein the waterproof film on the indoor side and the waterproof film on the back side of the hut are joined at their peripheral edges. Textile ceiling boards. 2. The inorganic fiber ceiling panel according to claim 1, wherein the waterproof film on the indoor side is provided with an uneven pattern and / or a printed pattern. 3. The waterproof film on the back side of the hut is made of a heat-shrinkable film, and is heat-shrinkable.
Inorganic fiber ceiling board as described. 4. The inorganic fiber ceiling panel according to claim 1, wherein the waterproof film on the indoor side and the waterproof film on the back side of the cabin are joined by heat fusion.